0024784: Move documentation in CDL files to proper location

Mostly duplicated comments were removed and missing ones were moved
into dedicated class CDL files.
Some more duplicated comments were removed from CDL files.
Correction of merge

src/AppDef/AppDef.cdl

@@ -43,25 +43,16 @@ uses AppParCurves, Approx, gp, TColgp, TCollection, Standard, MMgt, math, FEmToo
 is
 
 class MultiPointConstraint;  
-    ---Purpose: a MultiPointConstraint is a set of points which have the same range 
-    -- in the MultiLine and the same constraints.
-
 
 class MultiLine;
-    ---Purpose: this is the organized set of points.
 
 class MyLineTool;
-    ---Purpose: example of MultiLine tool corresponding to the tools of the packages
-    -- AppParCurves and Approx. For Approx, the tool will not addd points
-    -- if the algorithms want some.
 
 deferred  class  SmoothCriterion;
 
 class  LinearCriteria;
                  
 class Variational;
-     ---Purpose: computes the approximation of a Multiline by
-     --          Variational optimization.
 
 
 --- Classes instanciees:

src/AppDef/AppDef_MyLineTool.cdl

@@ -15,6 +15,9 @@
 -- commercial license or contractual agreement.
 
 class MyLineTool from AppDef
+    ---Purpose: example of MultiLine tool corresponding to the tools of the packages
+    -- AppParCurves and Approx. For Approx, the tool will not addd points
+    -- if the algorithms want some.
 
 uses MultiLine     from AppDef,
      Pnt           from gp,

src/AppDef/AppDef_Variational.cdl

@@ -23,7 +23,8 @@ class Variational from AppDef
     ---Purpose: This class is used to smooth N points with constraints
     --          by   minimization  of quadratic  criterium   but  also
     --          variational criterium in order to obtain " fair Curve "
-    --          
+    --          Computes the approximation of a Multiline by
+    --          Variational optimization.
 
 uses Matrix                    from math,
      Vector                    from math,